Internal Schematic of MQ-3 Sensor Module. The MQ-3 Alcohol Detection Sensor Module circuit diagram is given below. This module's design is relatively basic and only requires a few components to ...

DIY Alcohol Breath Analyzer – Circuit. Fig. 2 shows the circuit diagram of the alcohol detector. The circuit includes an Arduino Uno board (MOD1), four LEDs (L1 through L4), two buzzers (B1 through B2 ...

Fig. 1 shows a circuit of the alcohol level tester. Alcohol sensor MQ3 is used here to detect the alcohol fumes’ concentration. Fig. 1: The alcohol level tester circuit diagram Pins 2 and 5 of MQ3 are ...

Circuit Diagram for IR Motion Sensor Module. The schematic diagram of the IR Motion sensor is shown below. The schematic itself is very simple and needs a handful of generic components to build. If ...

The Breath Analyser consists of the MQ3 sensor. Paired with the RISC-V processor. MQ3 sensor module has a built in LM393 precision comparator which converts the anlog signal to digital output for the ...